static void Main(string[] args)
{
Account acc = new Account("Hubert", 500);
Console.Out.WriteLine(acc);
Observer o = new LogObserver(acc);
acc.registerObserver(o);
acc.deposit(300);
acc.withdraw(178);
acc.withdraw(1000);
acc.deposit(700);
acc.removeObserver(o);
acc.deposit(1000);
Console.In.ReadLine();
}